B1357 – Ignition Run Circuit Short To Battery

The ODBII code B1357 indicates a short circuit in the ignition run circuit to the battery, suggesting that there is an unintended connection causing the circuit to receive constant power, which can affect the vehicle’s electrical systems.

The severity of ODBII code B1357 is moderate to high.

Common Causes For: B1356 Ignition Run Circuit Open

• Shorted wiring or connectors
• Faulty ignition switch
• Damaged or corroded connectors
• Malfunctioning body control module (BCM)
• Faulty relay or fuse
• Improperly installed aftermarket accessories
• Grounding issues

Common misdiagnosis for B1357 Ignition Run Circuit Short To Battery

• Faulty ignition switch
• Shorted wiring harness
• Defective body control module (BCM)
• Malfunctioning relay
• Battery issues
• Faulty fuses
• Grounding problems
• Incorrectly installed aftermarket accessories

Common Troubleshooting Steps

The OBD-II code B1357 indicates a problem with the ignition run circuit, specifically a short to battery. This code can be associated with various issues in the vehicle’s electrical system. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Battery Voltage:
• Ensure that the vehicle’s battery is fully charged and in good condition. A weak or failing battery can cause various electrical issues.
• Inspect Fuses:
• Check the fuses related to the ignition system and the body control module (BCM). Replace any blown fuses.
• Visual Inspection:
• Inspect the wiring and connectors associated with the ignition circuit. Look for signs of damage, corrosion, or loose connections. Pay special attention to areas where wires may rub against metal or other components.
• Check for Shorts:
• Use a multimeter to check for continuity in the ignition run circuit. Look for any shorts to ground or to battery voltage. If you find a short, trace the wiring to locate the source.
• Test the Ignition Switch:
• The ignition switch can sometimes fail or develop internal shorts. Test the ignition switch for proper operation and continuity in the run position.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Body Control Module (BCM):
• If the vehicle is equipped with a BCM, check for proper operation. A malfunctioning BCM can cause various electrical issues, including problems with the ignition circuit.
• Check Ground Connections:
• Ensure that all ground connections related to the ignition system are clean and secure. Poor ground connections can lead to erratic electrical behavior.
• Look for Aftermarket Modifications:
• If any aftermarket accessories or modifications have been made to the vehicle’s electrical system, inspect them for proper installation and operation. They can sometimes cause conflicts with the factory wiring.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to understand the ignition circuit’s layout and identify any potential problem areas. 1
• Professional Diagnosis:
• If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1357 code. Always remember to take necessary safety precautions when working with the vehicle’s electrical system.